function dayToweek(day){
    switch (day){ 
        case 1: return "星期一"; break;
        case 2: return "星期二"; break;
        case 3: return "星期三"; break;
        case 4: return "星期四"; break;
        case 5: return "星期五"; break;
        case 6: return "星期六"; break;
        default: return "星期日";
    }
}